COMPARISON OF FREQUENCY-SELECTIVITY AND CONSONANT RECOGNITION AMONG HEARING-IMPAIRED AND MASKED NORMAL-HEARING LISTENERS
COMPARISON OF FREQUENCY-SELECTIVITY AND CONSONANT RECOGNITION AMONG HEARING-IMPAIRED AND MASKED NORMAL-HEARING LISTENERS
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DOI：
10.1121/1.403697
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发表时间：
1992-04-01
影响因子：
2.4
通讯作者：
SCHAEFER, AB
中科院分区：
文献类型：
--
作者：
DUBNO, JR;SCHAEFER, AB
使用有助于比较绝对阈值在幅度和配置上不同的听众之间的性能的技术，确定正常听力和听力受损的听众的频率选择性和辅音识别。 首先，对于六名耳蜗听力损失受试者中的每一位，获得了陷波噪声和窄带噪声掩蔽器中的掩蔽阈值，并将其与三名听力正常听众的结果进行比较，通过使用频谱形状的宽带噪声掩蔽，这些听众的阈值与受损听众的阈值精确匹配。 其次，对于听力受损的听众及其蒙蔽的正常听力对照，在根据发音指数预测选择的几个语音呈现级别上获得了辅音识别的测量结果，以确保听众之间具有相同的语音频谱可听度。 结果表明，即使受试者之间的阈值相等，听力受损的听众的频率选择性也比蒙蔽的正常听力听众差，但与正常频率选择性的偏差小于与安静状态下听力正常的听众相比估计的值。 听力受损听众的临界比率与正常人相当。 尽管频率选择性降低，但当在确保受试者之间平等的语音频谱可听度的条件下评估表现时，听力受损受试者和蒙蔽正常听力受试者之间的辅音识别没有一致的差异。
Frequency selectivity and consonant recognition were determined for normal-hearing and hearing-impaired listeners using techniques that facilitate comparisons of performance among listeners whose absolute thresholds vary in magnitude and configuration. First, for each of six subjects with cochlear hearing loss, masked thresholds in notched noise and narrow-band-noise maskers were obtained and compared to results for three normal-hearing listeners whose thresholds were precisely matched to the impaired listeners' by masking with spectrally shaped broadband noise. Second, for hearing-impaired listeners and their masked normal-hearing controls, measurements of consonant recognition were obtained at several speech-presentation levels selected on the basis of articulation-index predictions to assure equal speech-spectrum audibility across listeners. The results suggest that frequency selectivity is poorer for hearing-impaired listeners than for masked normal-hearing listeners, even when thresholds among subjects are equated, but the deviation from normal frequency selectivity is smaller than estimated from comparisons with normal-hearing listeners in quiet. Critical ratios for hearing-impaired listeners are equivalent to normal. Although frequency selectivity is reduced, there is no consistent difference in consonant recognition between hearing-impaired subjects and masked normal-hearing subjects, when performance is assessed under conditions that assure equal speech-spectrum audibility across subjects.